Features: - The line finder can quickly find the required line pairs among numerous ones. - It's adaptable to RJ45 terminal & RJ11 terminal and other metal wire in low electricity. - In a noisy environment, you can put on the earphones to accurately find the target cable through comparing the strength of "beep beep" sound. Adjust the volume knob to make the volume proper and avoid being interfered. - We only need the emitter to test the status of working of telephone lines, such as judging TIP or PING line and judging whether the telephone line is idle, ringing or off-hook. Rapidly find the target wire from among plenty of telephone wires, network wires, and all types of connected operating Ethernet switch /Router/PC. - Plug one side of the cable into the emitter and the other side into the receiver, it can trace cable assignment and cable state (2-wire), also can be used test physical connection status of network cable, such as open circuit, short connection, miswire and reverse connection. It can take place of cable tester. Specifications: Wire tracker emitter size: 125*48*25mm Wire tracker receiver size: 175*40*24mm Package included: 1 x Wire Tracker Emitter (Battery not included) 1 x Wire Tracker Receiver (Battery not included) 1 x Earphone 1 x RJ45 Adapter 1 x RJ11 Adapter 1 x Alligator Clip Adapter 1 x Tool Kit 1 x User Manual Notes: 1. Manual measuring, please allow 1 ~ 3mm error,thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.